Stephen d



vThe journal-blocks() D,

I Sintra @met Y STEPHEN.

am: .4pm 2z, 1869.

11:93am. SAWS.

fr v um di Grinding Circular Saws; and I do hereby declare the following to be a full, clear,`and exact description of the construction and operation o f the same, .reference being had lto the accompanying drawings, in which an isometrical view of the machine is given.

Before the date of my invention,'the rotary motion 'ven to the saw was imparted, in these machines, by one of which only was ro- 'ction-pulleys or rollers', tated by the drivin g-mechanism, the other being rotated by the friction of the surface of the saw, against which the roller wasv pressed by a spring. The motions of thus, in a measure, independent of the rollers being each other, there was no certainty o'f obtaining a: uni- 'form rotation of the saw, nor of grinding it witha true surface.

These difficulties are obviated the r 1in-whichille the saw are arranged, as will be more fully set out hereafter.

nt-rolling the saw in such a manner as to impart a uniform aud positive rotation toit during the operation of grinding; and also in mechanismfor moving "andadiusting theA giindstone to and from theface of the saw, in combination with the mechanism for holdf grindstone and its adjusting-apparatus,are secured to and supported 'bythe frame A A B. l

whi h support the c nds of. theshait I of the grindstone, areal-ranged to move on the 'slides O O, that are secured on the frame.

` F Fsare two screw-rods, which workin screw-holes fln'the j purnul-blockaand arensecured tcthe'b'evelswell? `I nesli witlif the pinions U.U,onthe fan'd-ihe "a uniform motion. v G is suppo d by'the two brackets N N f o `rthe en dof the' frame ;A and on the front en'ddfb-the thereis a bevel-gear, S, which meshesl with the pinion [Exon theinclined shaft H'. 1 i This shaft is supported by the standards K L, -and has a handle, P, secured to its upper end; As. the handle l? .is .turnedthe grindstone D is moved either (toward or-away from the saw, through the medium of `'the'rods E G 'H, and the gears B. S T U. f .The grindstoue D may be driven by means of aband- .iivhh'tachedtolthe end ofthe shaft, I.V

`-.1 irreali'nimble head that hold ,the rollers n' and f q, that supports .the saw at its centre, 'are'. 'lecuredztothe carriage K.

in I my invention by llhewaysf', on whichthe carriage travels, are se- I Be it known that I', STEPHEN D. 'LUcmiunfiiftheV city, county, and" State of New York, have inventeds certain new and useful Improvements iulidachines-for'A cured en theframe B. t Ther ilcrssEfFQ which impart a rotary motion to g-,ahd control the saw during the process of grinding, are -geaif d togethenandmotin is given to these gears S' '1" by, means 'of the pulley D', which is secured on the P 'a' K i i This pulle is' rotated by' 'a belt, driven by a drum of sucient len riage.

The roller llil is movable,with regard to the thickness; and tliejneans-for operating the same cousist of the L-shaped lever '11',piv'oted at It', which forms, at its upper end, a bearing for one end of the shaft R', on which the gear Sis secured, an Aear, g', threaded 'against a projection, g", on ,the stationary .bearing d,' of the shaft-P', andthe' coil springen the rod e', which acts on the lower end of thelever i', with a tendency lding and controlling;

My invention consists in mechanism .for holding and AtoU-press. the twofrellerastrongly-togetherrand gripe the saw. v

s When it is desired tov admit or rempve av saw, the

pressure of the-spring is eounteracted and the rollers readily separated by means of the set-screw-h, which works against the stationary projection'g".

The head carrying the rollers is adjusted on the car-I between the centre or bearing of the saw and the radius. Y

- Thearbor q is so constructed that the saw is securely held in place on the pin p, while its centre is permitted to advance up to the edge of the grindstone. The rest, for giving a concave, convex, or parallel surface to the face of the saw, is pivted at i, and is so operated at proper intervals acting on the screw l, that itis pressed against or withdrawn from the surface of the saw that is interposed and uniform manner, vor it remains stationary, as may be required.

and. drawings of an application for a patent for similar improvements, filed by me lon the 22d of May, to which reference is made for a more minute description thanis here given. 'The operation of the machine is as follows:

The stone saw by turning adjusted tobe iu Iline with the/face of the roller F', and

press the rollers E' and F' suiiiciently hard against the saw to drive' it. Motion is then'applied to thesever'al pulleys,` which operate lthe 4different mechanism. A positive motion isJthus given to the saw at all l'fto allow for the travel of the carroller F-,to allow for theadmission of saws of different -'for the passage of a set-screw, h,'whose point works riage by means of a clamp and screw, which work in a T-shaped slot, i', in the carriage', so'that the distance Y lrollers can be readily adjusted for saws of 'different ,l

by suitable mechanism between it and the face of -the grindstone in a regular T 2 The construction of the-arborj`or bearing, and of the i movable rest h, is sct out at large in the specification D is brought up against the face of the thehandle P. The movable rest h is the coiled spring on therod d is compressed, so as to.

1. A pair of geared rollers, arranged to grasp the saw on opposite sides Aby a spring pressure, substantiall)- as described, and for the purpose specified.

2. 'lhe combination of a p'air of geared rollers, for

driving and controlling the saw, with a reciprocating carriage, upon which the saw is supported, that moves in a plane parallel to the axis ofthe grindstone, so as to present the saw to the aetiou of the stone, substantially as described and specified.

3. The arrangement'of the mechanism for moving the grindstone to and from the surface of' the saw, in combination with the rollers for rotating the saw, and a reciprocating carriage, which holds and moves the saw, substantially as described, and for the purpose A STEPHEN D. TUCKER. Witnesses:

THOMAS BELL, J om COCHRAN. 

